In situ TEM study of the sodiation/desodiation mechanism of MnO2nanowire with gel-electrolytes

Zhi Zhang, Jiasheng Qian, Wei Lu, Cheuk Ho Chan, Shu Ping Lau, Jiyan Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


In this work, in situ transmission electron microscopy study of the electrochemical sodiation and desodiation processes was performed in a nanobattery which consisted of a single MnO2nanowire and different kinds of gel-electrolyte. It is found that after full sodiation, single crystalline MnO2nanowire is transformed to a mixed nanocrystalline phases of Na2O and MnO, and the following cycles are controlled by the reversible conversion reaction between NaMnO2and MnO. Both in situ electrochemical test and ex situ battery test show that the glyme-based gel-electrolyte is more suitable for the MnO2nanowires anode materials. It is also revealed that the MnO2nanowire expansion ratio strongly depends on the diameter of the nanowires. This work provides a new insight on the sodiation/desodiation mechanism in MnO2nanowire and gel-electrolyte, and may pave the path for the development of practical sodium-ion batteries with gel-electrolyte.
Original languageEnglish
Pages (from-to)91-97
Number of pages7
JournalEnergy Storage Materials
Publication statusPublished - 1 Nov 2018


  • Gel-electrolyte
  • In situ TEM
  • MnO nanowire 2
  • Sodium-ion battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Energy Engineering and Power Technology


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